Magnetic separator



* 4 5 with moved separating A separators .may likewise be used. -When g',separator. For

Patented Feb. 15, 1927.. l

UNITED STATES PATENT oEFicE eEoaG ULLBIGH, or MAGDEBURG, GERMANY,' AssIGNon iro' THE FIRM FRIED.

KBUPP GRUSONWERK AKTIENGESELLSCHAFT, l? MAGDEBURG-BUCKAU, GER-Application led February 28, 1925, Serial No.

. i The invention deals with a rocess f or the magnetic separation ofcru e material of various size of, grains.. In order tobe 1nl 'aposition to treat various sizes of .grains 1t 5 was hithertoeithernecessary to use several separating contrivances each of which 1n dAconformity with its-peculiarity could'only be' adapted toa special'size of grains, or, if only one separ tor is working, the varioussizes-of ,grains had to be treated on same, one after another. Theformer process makesit necessary to provide several separatorsincreasing thereby considerably the cost-price and the costs of runnlngthe plant. This is especially of great importance'for plants in whichonly comparatively small quantities of'suchmaterial are treated. Thesecond process requires after the kinds of grains have been separated asingle treatment of each size of grains,' one after another. -It mustthen be kept in'vie'w) i, e., -for drum-separators rotating at uniformspeed of themoved separatingsurfacethat each kind of grains drops o oris thrown oif at a special angle. vItl would therefore 'eitherbenecessary to adjust especially for each kind of grains the catchingdevices for the material, or the speeds of rotation Y of the separatingsurface, or both. .It .is

ao obvious that thoughfsaid process' is cheaperthan the former, itisrather circumstantial, wearisome and less productive.I Y E Alltheaforesaid disadvantages can be removed by the process dealt with by theinvention. By the new process,l several of grains canbe treated side byside o n a common separating surface or on two. or more 4separating suraces set Vin motion together, whilst the magnetic 'material is eifectedindependently.

ItV will be expedient tov use rum-separators. for the simultaneousVseparation of varifus sizes of grains, but other separatorsv surface,i. e.- bandusindrum-'separatqrs the streams of nia-.- teria contaimngthe several sizes of grains..4 are charged side by side into the drum'-each stream of material one provides on the side where the materialA-videfhwith 'a screen,

separation of the several 40 streams of material into magneticandnonranged 1n such a MAGNETIC sEzPABA'roE. y

12,286, and .in Gernianyseptembr 23, 1920.

drops a special terial is caught, being adjustable according torequirements. I

Instead of a single drum to be used for all streams of vmaterial incommon one can ari-ange likewise side by side several drums which areset'in motion together.' One can likewise graduate the ydrums in such away, that they yary in diameterv within the touch of the various streamsof material. In the same way the -drums when'A set in motion togethercan be graduated as to diameter l This lmaybe expedi-v one againstanother. ent if .the sizes of material diier very much so that with thesame diameter of the drum the angle in which the sizes'of material dropbecomes too unlike. In the various grades the lspeed at rt'hecircumference varies and the `difference the various 'streams ofmaterial is considerably di1ninishe`d,' so that by adjustin simetal.'sheet, where Athe ma- I `in the angle -of the'drop of.

multaneously the several partition wa s a very pure separation' of. the'magnetic and of' the non-magnetic material can be attained.

In order to separate admission'of the sizes of materiala `feeding' table(for common use) provided with two or more table surfaces laced onebelow another. Each of said tabJ e surfaces with the exception of thewidth of mesh of said screens decreasing Vfrom top tol bottom.- Alltable surfaces are provlded with guiding mechanisms (discharge ends)which arel directed in such a Wa of .grains wandering: over t e severaltablesurfaces .are charged side by side on Athe separating surfaces.This can also be arwa that the spouts of the table-surface disc argesare at 'various distances from the vertical axial centreline of the.drum-separator, in order to be able when e., g. treatino two diierent.sizes ,of

rains tof'feed the in. 4about'fthe vertex o the ldrumv and thecoarserparticles below. the vertex, i. e.' in.

it is attained that the magnetic particles of -ner articles of materialsave manual labour one may use for the 'separation as well as for thethe lowest one, is prof that the` sizes loo-L same already adhere closeto the drum before arrivin on the discharge side of the drum, when 1t isless easy to throw them olf.

In the drawing a drum-separator suitable for the execution of the newprocess is shown by way of example viz, in-

Fig. l in lateral elevation, Fig. 2 in front elevation, Fig.'3 in planaelevation, Figs. 4 and 6, with modifications, while Fig. 5 shows theadjustable partition.

Fig. 7 is a side elevation of a further 4modified form of the magneticseparator shown in Fig. 1. L

Fig. 8 is a front view thereof, and

Fig. 9 is a plan view thereof.

In accordance with the represented example, the crude material yischarged on an oscillating table fitted with two table surfaces 'aand barranged one below the other. The crude material drops in the first in'-stance into the upper table surface a which is transformed into screen cat the charging-spot. The two streams of material wander across thetable surfaces a and b to separating drum cl. By means of the guidingmechanisms (discharges) e f the two currents of material are conductedin such a way that they reach the separating surfaces of drum d side byside. At the side of drum d where the material drops the partition wallsg and I are povidedfor the purpose of separating the magnetic and thenon-magnetic stuff.

As mentioned above, when the seperating surfaces are arranged on thesame drum, it may be desirable to regulate the throw of these surfacesby differentiating their ciryco cumferential extents. Thus, in Fig. 4,the drum d is graduated so that the separating rings are of differentdiameter. The coarser material will thus be fed to the separatingsurface z' while the finer material will be fed to the surface la, asexplained.

' Substantially the same effect .may be se cured by the adjustment ofthe spouts, as shown in Fig. 6, according to which the liner grains arefed by the spout t to its associated separating ring near the tothereof, while the coarser particles are fed by means of the spout u toits associated separating ring at a point substantially below the vertexof the ring on its ascendmg surface. l s .the *example for demonstrationpur-4 poses represents a drum with absolutely uniform diameter, itfollows that the speed at the circumference of Athe separating surfacesis identical for both streams of material. Owing to said -two streamsbeing made up of stuftl of reciprocally varying size, it is obvious thatthey drop off at different i hts and are thrown oli respectively aterent angles. This is complied with by each partition wall being placedin special bearings and being adjustable. According to Figs. 2, 3 and4vonly an adjustment by he di is provided. But the rotary partitionwalls 'can likewise be adjusted in another manner by themselves orincluding their rotary axis. Each partition Wall can e. g. be arrangedto slide in guide-arms located on the rotary axis or a second sheetarranged to slide on the main sheet may be provided for lengthening eachpartition wall. Each rotary axis may e. g. be placed on a sliding groundplate which can be fixed at various distances from the drum. Thus,according to Fig. 5, the partition wall l1. is provided with a slot orslots g and attached to an axle p by means of set screw o extendingthrough the slot. A radial adjustment of the wall relative to the axle pis thus permitted by loosening screw o. The axle p is journaled in abearing r and is rockable in said bearing upon the loosening of the setscrew, as shown. The bearing 7' at the same time is slidabletransversely to the axis of the drum in a slot provided in itsassociated base plate upon the loosening of bolt s. The separation intosizes of grains may of course be attended to beforehand so that theseare then conducted side by sideto the separatin drum, sol that thescreens onv the upper ta 1c surface can be dispensed with.

In the embodiment shown in Figs. 7 to 9 the sifting and delivery device1 consists of the superimposed table surfaces 2, 3, and 4. Each of thetable. surfaces 3 and 4 is provided with a sieve 5 and 6 respectively.The two sieves are of different sized mesh. From the three tablesurfaces 2, 3, 4 chutes 7, 8, 9 lead tothe separating surfaces 10, 11,12, so that three different streams of material can be simultaneouslybut separately separated by the magnetic separator. The material to beseparated is dumped upon the sieve 6 of the uppermost table-surface 4.The

, coarse material not falling through the sieve -conductthevnon-magnetic material -ffalling from` the separating surfaces away.

Claims:

1. A magnetic separator comprising, juxtaposed l coaxially arrangedrotating magnetic separating surfaces, means for grading the materialsto be separated according to size of grains and lfeeding the granular`material as to size in separate streams to the' `separating surfaces,said means for grading comprising a plurality 'of table surfaces placedone above another, screens in all said table surfaces except the bottomone,

5 taposed coaxially arran lfeeding the granular material as to size inseparate streams to the separating surfaces, the number of whichcorresponds to the number of streams of the material to be separated.

- size,

. 3. A magnetic separator comprising, juxtaposed coaxially arrangedrotating magnetic separating surfaces, said surfaces having differentdiameters, means for classifying the material'fto be separated accordingto means for feeding the granular material as to size in separatestreams to the separating surfaces, the number of which corresponds tothe number of streams of the material to be separated.

In testimony whereof ificaton is signed., Dn. ING. n. o.

the foregoing Aspec- GEORG ULLRICH.

